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                                <h1 id="php&#x5E38;&#x7528;&#x51FD;&#x6570;">PHP&#x5E38;&#x7528;&#x51FD;&#x6570;</h1>
<table>
<thead>
<tr>
<th>&#x51FD;&#x6570;&#x540D;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td>exit(string)</td>
<td>&#x662F;&#x76F4;&#x63A5;&#x505C;&#x6B62;&#xFF0C;&#x5E76;&#x4E14;&#x4E0D;&#x8FD0;&#x884C;&#x540E;&#x7EED;&#x4EE3;&#x7801;&#xFF0C;exit()&#x53EF;&#x4EE5;&#x663E;&#x793A;&#x5185;&#x5BB9;</td>
</tr>
<tr>
<td>die(string)</td>
<td>&#x662F;&#x9047;&#x5230;&#x9519;&#x8BEF;&#x624D;&#x505C;&#x6B62; opendir(&apos;./upload-from&apos;) or die(&apos;&#x54E6;&#x54E6;,&#x51FA;&#x95EE;&#x9898;&apos;)</td>
</tr>
<tr>
<td>md5(string,raw)</td>
<td>&#x8BA1;&#x7B97;&#x5B57;&#x7B26;&#x4E32;&#x7684; MD5 &#x6563;&#x5217;</td>
</tr>
</tbody>
</table>
<h2 id="json-&#x51FD;&#x6570;">JSON &#x51FD;&#x6570;</h2>
<table>
<thead>
<tr>
<th>&#x51FD;&#x6570;&#x540D;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td>json_encode</td>
<td>&#x5BF9;&#x53D8;&#x91CF;&#x8FDB;&#x884C; JSON &#x7F16;&#x7801;</td>
</tr>
<tr>
<td>json_decode</td>
<td>&#x5BF9; JSON &#x683C;&#x5F0F;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x8FDB;&#x884C;&#x89E3;&#x7801;&#xFF0C;&#x8F6C;&#x6362;&#x4E3A; PHP &#x53D8;&#x91CF;</td>
</tr>
</tbody>
</table>
<h2 id="php&#x5B57;&#x7B26;&#x4E32;&#x51FD;&#x6570;">PHP&#x5B57;&#x7B26;&#x4E32;&#x51FD;&#x6570;</h2>
<h3 id="substr-----&#x53D6;&#x5F97;&#x90E8;&#x4EFD;&#x5B57;&#x7B26;&#x4E32;">substr --- &#x53D6;&#x5F97;&#x90E8;&#x4EFD;&#x5B57;&#x7B26;&#x4E32;</h3>
<blockquote>
<p>substr()&#x622A;&#x53D6;&#x5B57;&#x7B26;&#x4E32;&#x51FA;&#x73B0;&#x4E71;&#x7801;&#x95EE;&#x9898;&#x8BE5;&#x600E;&#x4E48;&#x529E;&#xFF1F;</p>
</blockquote>
<p>&#x5728;PHP&#x7A0B;&#x5E8F;&#x5F00;&#x53D1;&#x4E2D;&#xFF0C;&#x7ECF;&#x5E38;&#x4F1A;&#x6267;&#x884C;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x622A;&#x53D6;&#x64CD;&#x4F5C;&#xFF0C;&#x6BD4;&#x5982;&#x8F93;&#x51FA;&#x4FE1;&#x606F;&#x5217;&#x8868;&#x65F6;&#xFF0C;&#x6807;&#x9898;&#x4E0D;&#x5B9C;&#x8FC7;&#x957F;&#xFF0C;&#x6253;&#x5370;&#x6587;&#x7AE0;&#x6458;&#x8981;&#x65F6;&#xFF0C;&#x4E5F;&#x8981;&#x6267;&#x884C;&#x4E00;&#x7CFB;&#x5217;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x622A;&#x53D6;&#x64CD;&#x4F5C;&#x3002;&#x9047;&#x5230;&#x8FD9;&#x4E9B;&#x9700;&#x6C42;&#x65F6;&#xFF0C;&#x6211;&#x4EEC;&#x7ECF;&#x5E38;&#x4F1A;&#x60F3;&#x5230;&#x4F7F;&#x7528;substr()&#x65B9;&#x6CD5;&#x6765;&#x5B9E;&#x73B0;&#xFF0C;substr()&#x5BF9;&#x5168;&#x82F1;&#x6587;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x622A;&#x53D6;&#x662F;&#x6BD4;&#x8F83;&#x9002;&#x5408;&#x7684;&#x3002;</p>
<p>&#x4F46;&#x5B57;&#x7B26;&#x4E32;&#x53EA;&#x8981;&#x51FA;&#x73B0;&#x4E2D;&#x6587;&#x5B57;&#x7B26;&#xFF0C;&#x5C31;&#x6709;&#x53EF;&#x80FD;&#x5BFC;&#x81F4;PHP substr&#x4E2D;&#x6587;&#x4E71;&#x7801;&#xFF0C;&#x56E0;&#x4E3A;&#x4E2D;&#x6587;UTF-8&#x7F16;&#x7801;&#xFF0C;&#x6BCF;&#x4E2A;&#x6C49;&#x5B57;&#x5360;3&#x5B57;&#x8282;&#xFF0C;&#x800C;GB2312&#x5360;2&#x5B57;&#x8282;&#xFF0C;&#x82F1;&#x6587;&#x5360;1&#x5B57;&#x8282;&#xFF0C;&#x622A;&#x53D6;&#x4F4D;&#x6570;&#x4E0D;&#x51C6;&#x786E;&#xFF0C;substr()&#x786C;&#x751F;&#x751F;&#x5730;&#x5C06;&#x4E00;&#x4E2A;&#x4E2D;&#x6587;&#x5B57;&#x7B26;&#x201C;&#x952F;&#x201D;&#x6210;&#x4E24;&#x534A;&#xFF0C;&#x9020;&#x6210;&#x65AD;&#x5F00;&#x7684;&#x5B57;&#x7B26;&#x4F1A;&#x628A;&#x5176;&#x540E;&#x7684;..&#x62C9;&#x8FC7;&#x6765;&#x4E00;&#x8D77;&#x505A;&#x4E00;&#x4E2A;&#x5B57;&#xFF0C;&#x6240;&#x4EE5;&#x51FA;&#x73B0;&#x4E86;PHP substr&#x4E2D;&#x6587;&#x4E71;&#x7801;&#x3002;</p>
<p>&#x8BED;&#x6CD5; :</p>
<pre><code>string substr (string string, int start [, int length])
</code></pre><p>&#x8BF4;&#x660E; : substr( )&#x4F20;&#x56DE; string&#x7684;&#x4E00;&#x90E8;&#x4EFD;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x7531;&#x53C2;&#x6570; start&#x548C; length&#x6307;&#x5B9A;&#x3002;</p>
<p>&#x5982;&#x679C; start&#x662F;&#x6B63;&#x6570;&#xFF0C;&#x4F20;&#x56DE;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5C06;&#x4F1A;&#x4ECE; string&#x7684;&#x7B2C; start&#x4E2A;&#x5B57;&#x5143;&#x5F00;&#x59CB;&#x3002;</p>
<h4 id="mbstring&#x6269;&#x5C55;&#x5E93;">mbstring&#x6269;&#x5C55;&#x5E93;</h4>
<p>&#x4F7F;&#x7528;mbstring&#x6269;&#x5C55;&#x5E93;&#x7684;<code>mb_substr()</code>&#x622A;&#x53D6;&#x5C31;&#x4E0D;&#x4F1A;&#x51FA;&#x73B0;&#x4E71;&#x7801;&#x4E86;&#x3002;</p>
<p>&#x53EF;&#x4EE5;&#x7528;<code>mb_substr()/mb_strcut()</code>&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;<code>mb_substr()/mb_strcut()</code>&#x7684;&#x7528;&#x6CD5;&#x4E0E;<code>substr()</code>&#x76F8;&#x4F3C;&#xFF0C;&#x53EA;&#x662F;&#x5728;<code>mb_substr()/mb_strcut</code>&#x6700;&#x540E;&#x8981;&#x52A0;&#x5165;&#x591A;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x4EE5;&#x8BBE;&#x5B9A;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x7801;&#xFF0C;&#x4F46;&#x662F;&#x4E00;&#x822C;&#x7684;&#x670D;&#x52A1;&#x5668;&#x90FD;&#x6CA1;&#x6253;&#x5F00;php_mbstring.dll&#xFF0C;&#x9700;&#x8981;&#x5728;php.ini&#x5728;&#x628A;php_mbstring.dll&#x6253;&#x5F00;&#x3002;</p>
<pre><code>&lt;?php
  echo mb_substr(&quot;php&#x4E2D;&#x6587;&#x5B57;&#x7B26;encode&quot;,0,4,&quot;utf-8&quot;);
?&gt;
</code></pre><p>&#x5982;&#x679C;&#x672A;&#x6307;&#x5B9A;&#x6700;&#x540E;&#x4E00;&#x4E2A;&#x7F16;&#x7801;&#x53C2;&#x6570;&#xFF0C;&#x4F1A;&#x662F;&#x4E09;&#x4E2A;&#x5B57;&#x8282;&#x4E3A;&#x4E00;&#x4E2A;&#x4E2D;&#x6587;&#xFF0C;&#x8FD9;&#x5C31;&#x662F;utf-8&#x7F16;&#x7801;&#x7684;&#x7279;&#x70B9;&#xFF0C;&#x82E5;&#x52A0;&#x4E0A;utf-8&#x5B57;&#x7B26;&#x96C6;&#x8BF4;&#x660E;&#xFF0C;&#x6240;&#x4EE5;&#xFF0C;&#x662F;&#x4EE5;&#x4E00;&#x4E2A;&#x5B57;&#x4E3A;&#x5355;&#x4F4D;&#x6765;&#x622A;&#x53D6;&#x7684;&#x3002;</p>
<h2 id="php-mail-&#x51FD;&#x6570;">PHP mail() &#x51FD;&#x6570;</h2>
<p>PHP mail() &#x51FD;&#x6570;&#x7528;&#x4E8E;&#x4ECE;&#x811A;&#x672C;&#x4E2D;&#x53D1;&#x9001;&#x7535;&#x5B50;&#x90AE;&#x4EF6;&#x3002; &#x8BED;&#x6CD5; mail(to,subject,message,headers,parameters)</p>
<table>
<thead>
<tr>
<th>&#x53C2;&#x6570;</th>
<th>&#x63CF;&#x8FF0;</th>
</tr>
</thead>
<tbody>
<tr>
<td>to</td>
<td>&#x5FC5;&#x9700;&#x3002;&#x89C4;&#x5B9A; email &#x63A5;&#x6536;&#x8005;&#x3002;</td>
</tr>
<tr>
<td>subject</td>
<td>&#x5FC5;&#x9700;&#x3002;&#x89C4;&#x5B9A; email &#x7684;&#x4E3B;&#x9898;&#x3002;&#x6CE8;&#x91CA;&#xFF1A;&#x8BE5;&#x53C2;&#x6570;&#x4E0D;&#x80FD;&#x5305;&#x542B;&#x4EFB;&#x4F55;&#x65B0;&#x884C;&#x5B57;&#x7B26;&#x3002;</td>
</tr>
<tr>
<td>message</td>
<td>&#x5FC5;&#x9700;&#x3002;&#x5B9A;&#x4E49;&#x8981;&#x53D1;&#x9001;&#x7684;&#x6D88;&#x606F;&#x3002;&#x5E94;&#x4F7F;&#x7528; LF (\n) &#x6765;&#x5206;&#x9694;&#x5404;&#x884C;&#x3002;&#x6BCF;&#x884C;&#x5E94;&#x8BE5;&#x9650;&#x5236;&#x5728; 70 &#x4E2A;&#x5B57;&#x7B26;&#x5185;&#x3002;</td>
</tr>
<tr>
<td>headers</td>
<td>&#x53EF;&#x9009;&#x3002;&#x89C4;&#x5B9A;&#x9644;&#x52A0;&#x7684;&#x6807;&#x9898;&#xFF0C;&#x6BD4;&#x5982; From&#x3001;Cc &#x548C; Bcc&#x3002;&#x5E94;&#x5F53;&#x4F7F;&#x7528; CRLF (\r\n) &#x5206;&#x9694;&#x9644;&#x52A0;&#x7684;&#x6807;&#x9898;&#x3002;</td>
</tr>
<tr>
<td>parameters</td>
<td>&#x53EF;&#x9009;&#x3002;&#x5BF9;&#x90AE;&#x4EF6;&#x53D1;&#x9001;&#x7A0B;&#x5E8F;&#x89C4;&#x5B9A;&#x989D;&#x5916;&#x7684;&#x53C2;&#x6570;&#x3002;</td>
</tr>
</tbody>
</table>
<pre><code class="lang-php"><span class="hljs-meta">&lt;?php</span>
$to = <span class="hljs-string">&quot;someone@example.com&quot;</span>;         <span class="hljs-comment">// &#x90AE;&#x4EF6;&#x63A5;&#x6536;&#x8005;</span>
$subject = <span class="hljs-string">&quot;&#x53C2;&#x6570;&#x90AE;&#x4EF6;&quot;</span>;                <span class="hljs-comment">// &#x90AE;&#x4EF6;&#x6807;&#x9898;</span>
$message = <span class="hljs-string">&quot;Hello! &#x8FD9;&#x662F;&#x90AE;&#x4EF6;&#x7684;&#x5185;&#x5BB9;&#x3002;&quot;</span>;  <span class="hljs-comment">// &#x90AE;&#x4EF6;&#x6B63;&#x6587;</span>
$from = <span class="hljs-string">&quot;someonelse@example.com&quot;</span>;   <span class="hljs-comment">// &#x90AE;&#x4EF6;&#x53D1;&#x9001;&#x8005;</span>
$headers = <span class="hljs-string">&quot;From:&quot;</span> . $from;         <span class="hljs-comment">// &#x5934;&#x90E8;&#x4FE1;&#x606F;&#x8BBE;&#x7F6E;</span>
mail($to,$subject,$message,$headers);
<span class="hljs-keyword">echo</span> <span class="hljs-string">&quot;&#x90AE;&#x4EF6;&#x5DF2;&#x53D1;&#x9001;&quot;</span>;
<span class="hljs-meta">?&gt;</span>
</code></pre>

                                
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